Ions
Control up to 20,000 particles of light! Ions is an addictive virtual
sandbox where you can create dazzling patterns in realtime. Ions runs
at 60 fps and really shows off the power of the iPad. There are
infinite creative possibilities with Ions - you won't be able to put it
down!

Use your fingers to either paint with ions or interact with them. Place
emitters to control where new ions are created and their initial speeds
and directions. Then use fields to either attract or repel ions,
altering their velocities.

Accelerometer support allows the ions to respond to gravity. You also
have five different looks to choose from; each one completely changes
the appearance of the ions. Additionally, you can save and load your
favorite layouts at any time.